I have never use alcohol and I do not have bubbles. I have found that if your base is too hot when pouring, bubbles will form. Using alcohol is fine. However, if you just let your base sit for a while, the bubbles should be gone.
Have to disagree here. If the soaps have hardened with bubbles, the bubbles won't go away. If the air has left them, you'll still be left with bubble scars. Alcohol, imo, is the way to go.
I never mentioned hardening the soap with bubbles. I understand that bubbles will harden if you leave it. The point is to have no bubbles at all. I let the base cool down before pouring. I do not harden it. I have been making MP for 15 years with various bases. I have used the microwave and also a melter. I have never used alcohol. I let the base cool down, gently stir prior to pouring and then pour slowly into the mold. My soap is bubble-free every time. Alcohol is fine if you want to use it. I never have had to use alcohol, and it is a step that I would rather not bother with if I can correct the problem in advance. I have also never in my life had a skin form on my soap in 20 seconds.